473,976 Members | 4,441 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Semaphore support?

dln
I can't seem to find a Semaphore class in the .Net framework. Does C#
provide any blocking container objects that will block a thread trying to
extract an element from an empty queue or does the .Net framework provide a
Semaphore object of some type? I've noticed a post to the urls
http://www.codeproject.com/csharp/Bo...ckingQueue.asp and
http://www.codeproject.com/csharp/Di...gSemaphore.asp, which will
work if necessary, but I'm more interested in native framework support if
possible.

Thanks.
Nov 16 '05 #1
2 3490
dln <dn**********@h otmail.com> wrote:
I can't seem to find a Semaphore class in the .Net framework. Does C#
provide any blocking container objects that will block a thread trying to
extract an element from an empty queue or does the .Net framework provide a
Semaphore object of some type? I've noticed a post to the urls
http://www.codeproject.com/csharp/Bo...ckingQueue.asp and
http://www.codeproject.com/csharp/Di...gSemaphore.asp, which will
work if necessary, but I'm more interested in native framework support if
possible.


No, there's no native framework support in 1.0/1.1, although there will
be in 2.0.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Nov 16 '05 #2
dln,

In .NET 1.1, there is no Semaphore class. You would have to call the
CreateSemaphore API function (through the P/Invoke layer) and work with
that.

In .NET 2.0, there is a Semaphore class that you can use which gives you
the semantics that you want.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"dln" <dn**********@h otmail.com> wrote in message
news:e0******** ******@TK2MSFTN GP11.phx.gbl...
I can't seem to find a Semaphore class in the .Net framework. Does C#
provide any blocking container objects that will block a thread trying to
extract an element from an empty queue or does the .Net framework provide a
Semaphore object of some type? I've noticed a post to the urls
http://www.codeproject.com/csharp/Bo...ckingQueue.asp and
http://www.codeproject.com/csharp/Di...gSemaphore.asp, which will
work if necessary, but I'm more interested in native framework support if
possible.

Thanks.

Nov 16 '05 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

7
4375
by: Bastian Hammer | last post by:
Hi I´m wondering why there are so few examples with Semaphore. Is it obsolete? I´ve got a Class Data. It offers 2 Threads methods for updating, editing, .. a private dictionary. Now I have to make sure, that both threads are synchronal,
1
2656
by: rushik | last post by:
Hello all, I m facing an interesting problem related to semaphore in php. We are using a huge business application running on LAMP. For database operations we are maintaining centralized DB manager classes in php which perform all the single table related activity. Before inserting new record we are acquiring semaphore on specific key (all the tables are having seprate sem keys), insert the record and release the semaphore.
5
4619
by: marvind | last post by:
I tried using a Semaphore class (have included the full listing reproduced from article Figure 1 at the end of this email) in .NET 1.1. It works fine most of the time, however, I see the following error occassionally: 08/28/2005 17:32:42.82, Verbose, QueryObject.MergeSubQuery, Exception: Too many posts were made to a semaphore in mscorlib. Server stack trace:
5
2533
by: Unni | last post by:
Hello all, I m facing a memory related problem with semaphores. Our business application uses semaphores extensively and the limit imposed by the OS on the number of semaphores that can exist on the system is only 128. This could be increased to a higher value but that would not be a permanant solution to my belief. We are using the sem_get, sem_acquire php functions. After the use we are releasing the semaphore by using sem_release.
2
2158
by: techi_C | last post by:
Hi I'm getting a problem while removing semaphore from system. Before removing semaphore I'm checking the usage count of a smaphore. // checking usage count usage_count = semctl(sem_ptr->semid, 1, GETVAL, NULL); if( usage_count 1 ) // return don't remove semaphore else
1
2281
by: cranfic | last post by:
Please help... To make it simple, I have a simple test C program which calls my semphore library functions only. (It doesn't call any db2 function at all). And the following is the test program: #include "hasem.h" #include <semaphore.h> #include <stdio.h>
0
2267
by: Samuel R. Neff | last post by:
I'm having trouble creating a Semaphore with read-access rights for everyone. Originally I was trying to use this code: semaphore = new Semaphore(maxLocks, maxLocks, "RwLock#" + name); but when using that code to create a Semaphore instance for an existing system semaphore (i.e., the second time the code gets hit), I get an UnauthorizedAccessException. So I tried specifying that everyone has read rights:
5
2733
by: GHUM | last post by:
hello, in my application I am using hSem = win32event.CreateSemaphore (None, 1, 1,"stringincludinginterfaceandport") rt=win32event.WaitForSingleObject (hSem, 0) if rt != win32event.WAIT_TIMEOUT: really_do_start_my_app() else:
0
1281
by: Christian Heimes | last post by:
Neal Becker wrote: No, it just provides unshared semaphores. You can either create your own Python extensions or you can use ctypes if you need a shared or named semaphore. Depending on your requirements you can choose between sem_init() or sem_open() from semaphore.h or the IPC API from sys/sem.h. Christian
0
10353
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
10171
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
11819
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
0
11408
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
11572
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
10908
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
1
8460
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
6558
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
3
3761
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.